Magnetic chuck for Milling machine?

Discussion on all milling machines vertical & horizontal, including but not limited to Bridgeports, Hardinge, South Bend, Clausing, Van Norman, including imports.

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Glenn Brooks
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Magnetic chuck for Milling machine?

Post by Glenn Brooks » Sun Nov 04, 2018 3:37 pm

So, is a magnetic chuck at all useful for workholding on a Milling machine?

Iam thinking it might be a nice thing to have to hold down small, thin pieces of flat bar...

Thanks
Glenn
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Harold_V
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Re: Magnetic chuck for Milling machine?

Post by Harold_V » Sun Nov 04, 2018 4:47 pm

Risky to use. It's important for work to be held rigidly when milling. The slightest movement often results in the tool picking up the part. Broken cutters and scrapped parts are generally the result. That's not to say that they can't be used with success, but it's all too easy to get in trouble. They are successful on surface grinders because of the low cutting pressure, but even on a surface grinder parts have been known to move.

H
Wise people talk because they have something to say. Fools talk because they have to say something.

Glenn Brooks
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Re: Magnetic chuck for Milling machine?

Post by Glenn Brooks » Mon Nov 05, 2018 12:48 am

Thanks Harold. That’s sort of what I suspected. One of the Metal heads has an extra he talked about giving up. But I haven’t a need except for milling small stuff- which may be even more problematic with really small contact area.

Glenn
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Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge

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NP317
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Re: Magnetic chuck for Milling machine?

Post by NP317 » Mon Nov 05, 2018 1:50 am

In the years of machining I've done with mills and lathes, manual and CNC, I've never required the use of a magnetic chuck.
It might be "cool' to have one, but I never had the need.
And they only work with ferrous materials.
'Just my own experience.
~RN

tetramachine
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Re: Magnetic chuck for Milling machine?

Post by tetramachine » Thu Nov 08, 2018 12:07 pm

In addition to what has already been stated, the flatness of the mounting face is the real issue. a piece of hot rolled steel will move with very little force, while a plate that is ground would take quite a lot to be moved.

Overall a bad idea, that will certainly lead to dramatic issues.
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JackF
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Re: Magnetic chuck for Milling machine?

Post by JackF » Thu Nov 08, 2018 2:11 pm

I got my 6X18 at auction for $30 JUST in case I ever get a surface grinder. :roll: :wink: In the meantime it is under the bench waiting for me to discover another use for it :wink:


Jack

John Hasler
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Re: Magnetic chuck for Milling machine?

Post by John Hasler » Thu Nov 08, 2018 2:14 pm

You'd need to box the part in the way you would if using glue or double-sided tape.

Harold_V
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Re: Magnetic chuck for Milling machine?

Post by Harold_V » Fri Nov 09, 2018 4:45 am

John Hasler wrote:
Thu Nov 08, 2018 2:14 pm
You'd need to box the part in the way you would if using glue or double-sided tape.
Don't encourage readers to do something stupid. Unless left hand cutters are used, the lifting power of a cut will often be enough to pull the part away from the chuck, which no amount of blocking will prevent.

As I said, it can work, but the risk of a mishap outweighs any possible gain.

H
Wise people talk because they have something to say. Fools talk because they have to say something.

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